Loudspeaker and the like



March 16, 1937. E 2,074,173

LQUDSPEAKER AND THE LIKE Original Filed March 27, 1955 ATTO NEY5 Patented Mar. 16, 1937 UNITED STATES PATENT OFFICE LOUDSPEAKER AND THE LIKE Robert Rodger Glen, Anglet, France, assignor to Glen's Patents and Holdings, Inc., New York,

Y N. Y., a corporation of Delaware July 4, 1984 2 Claims.

This invention relates to improvements in loudspeakers and the like (for example, horns r hooters) and has for its object generally to provide means whereby the tone quality of a loudspeaker or like instrument may be modified.

More specifically, it is an object of the invention to provide a loudspeaker or like instrument which has a vibrating diaphragm or sound cone,

1 with an associated sound screen or disk that is 9 supported within the sound cone in the path of the emitted sound, such disk being preferably in a plane transverse (for example, at right angles) to the cone axis and having its periphery disposed in spaced relation to the inner surface of the cone. In one form of the invention, the disk is circular and concentric with the cone axis.

Thedisk may be supported by threads, from the wall of the cone, or, alternatively, it may be carried by an axial rod supported at its other end on an external structure. This alternative form is described and claimed in my parent applica- 1 tion, Patent No. 2,049,767, dated August 4, 1936,

the apex of the cone may be varied to achieve a desired modification of the tone quality of the instrument.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had 4 to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is a diagrammatic view showing a vertical section of a sound cone for a loudspeaker provided with a screen disk in accordance with the invention and Fig. 2 is a section on the line 2-2 of Fig. 1 and looking in the direction of the arrows. A Like reference numerals refer to like parts throughout the several figures of the drawing.

Referring now to the drawing, a sound cone for a loudspeaker is shown at I; the cone having a full angle of 45 and being preferably constructed of papier-mach or other suitable resonant material. The cone is actuated in any convenient manner, for example, by means of an electrical driving unit connected to the apex, but not shown in the drawing in the interest of clearness of illustration. I

To achieve the desired modification of the sound produced by the cone I, in accordance with the invention, a relatively thick disk 2 is disposed at a suitable distance from the apex in a manner which intercepts sound. For the ordinary range of vocal sounds the distance from disk to apex is advantageously taken as approximately one and five-eighths inches (about four centimeters). The disk itself may be of any suitable material, such as soft aluminum or celluloid, and is supported in place by elastic means, such as rubber threads 3 connecting its periphery to the wall of the cone. The diameter of the disk is such that an annular space is left between the disk and the cone through which the sound is emitted. In this embodiment, the cone extends a substantial distance beyond the disk; for example, it may have a perimeter of fourteen inches (approximately thirty-five centimeters) at its widest part.

Since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In loudspeakers and the like, the combination with a sound cone, of an imperforate disk disposed within the cone at a desired point on the cone axis and in spaced relation to the innersurface of the cone, and means capable of absorbing vibration supporting said disk directly from the cone wall,

2. In loudspeakers and the like, the combination with a sound cone, of a disk disposed within the cone at a desired point on the cone axis and in spaced relation to the inner surface of the cone, and elastic threads secured to the periphery of said disk and to the cone wall for supporting said disk in the desired position.

ROBERT R. GLEN. 

